This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 8 |
| 5 | 40 |
| 6 | 338 |
| 7 | 1512 |
| 8 | 11368 |
| 9 | 84960 |
| 10 | 828972 |
| 11 | 7291900 |
| 12 | 85823668 |
| 13 | 958954152 |
| 14 | 12930529446 |
| 15 | 176651211776 |
| 16 | 2631044069296 |
| 17 | 41847091313152 |